Thanks for showing off your sick fast skills, Nick, and shaming us all. Oh, and it looks like that's going to be a really useful site. I didn't miss that.
You can download the OmniGraffle wireframe stencil Nick is using here for free, by the way. ;)
Blog
Automatically generate table of contents using jQuery
Janko at Warp Speed demonstrates a technique using jQuery to provide a navigable table of contents menu using the headings in your page content. I particularly like the method he's come up with for displaying headings to show the proportion of content for each section relative to the whole. I think you could do some nice styling to display the blocks as small multiples of proportion and scale in the margin. Nicely done and would work well with longer content, e.g. wiki pages.
http://www.jankoatwarpspeed.com/post/2009/08/20/Table-of-contents-using-jQuery.aspx
CSS Sprites with Inline Images
CSS-Tricks wrote up a tutorial demonstrating how to use CSS clipping to use image sprite on inline elements that flow with content. This is a nice little technique for small icons that you want to come immediately after text, for example. Check it out.